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The peptide HLNILSTLWKYRC, also known as Tet1 or G23, is a well-characterized brain homing peptide that selectively binds to GM1 ganglioside receptors expressed on neuronal cells. GM1 is highly enriched in neuronal membranes and plays a critical role in neuronal signaling and membrane organization, making this peptide a valuable targeting ligand for neurobiological and drug delivery applications.
Mechanism of Action: GM1-Mediated Neuronal Targeting
HLNILSTLWKYRC has been shown to interact with GM1 gangliosides on neuronal cell surfaces, facilitating selective binding and internalization. This interaction enables targeted delivery of peptide-conjugated cargos to neuronal tissues and supports transcytosis across the blood–brain barrier (BBB) under appropriate delivery conditions.
The presence of a terminal cysteine residue allows site-specific conjugation to nanoparticles, liposomes, or polymer-based carriers through thiol chemistry, enabling controlled orientation and functional display of the targeting peptide.
Applications in Blood–Brain Barrier (BBB) Transport
HLNILSTLWKYRC has been widely studied as a targeting ligand for nanoparticle-based brain delivery systems. In the study by Georgieva et al., peptide-functionalized polymersomes demonstrated enhanced transport across the blood–brain barrier, supporting the role of this peptide in facilitating nanoparticle transcytosis into brain tissue.
Further work by De Jong et al. established a quantitative, filter-free BBB model for evaluating nanoparticle transport, confirming that brain-targeting peptides such as HLNILSTLWKYRC can significantly influence endothelial transcytosis and delivery efficiency.
Applications in Neuroscience and Nanomedicine
- Blood–brain barrier transport studies
- Neuron-targeted nanoparticle delivery
- Liposome, polymersome, and LNP surface functionalization
- Neurodegenerative disease research
- Brain-targeted imaging probe development
- Peptide-mediated drug delivery to CNS tissues
Use in Nanoparticle and Drug Delivery Systems
The peptide is frequently conjugated to nanoscale carriers such as liposomes, polymersomes, and polymeric nanoparticles to enable targeted delivery to neuronal tissues. Its GM1-binding capability supports both cell-specific targeting and enhanced interaction with neuronal membranes.
The cysteine residue allows flexible conjugation strategies including disulfide linkage, maleimide coupling, or PEGylation, making HLNILSTLWKYRC suitable for a wide range of nanomedicine formulations.
Advantages of HLNILSTLWKYRC Peptide
- Specific targeting of GM1 ganglioside receptors
- Widely validated brain homing peptide
- Supports BBB transport and transcytosis studies
- Compatible with nanoparticle and liposomal delivery systems
- Easy conjugation via terminal cysteine residue
References
Georgieva JV, Brinkhuis RP, Stojanov K, et al.
Peptide-mediated blood-brain barrier transport of polymersomes.
Angew Chem Int Ed Engl. 2012;51(33):8339–8342. doi:10.1002/anie.201202001
De Jong E, Williams DS, Abdelmohsen LKEA, et al.
A filter-free blood-brain barrier model to quantitatively study transendothelial delivery of nanoparticles by fluorescence spectroscopy.
J Control Release. 2018;289:14–22. doi:10.1016/j.jconrel.2018.09.015
Related Products:
Fluorescently labeled peptides
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Cell-penetrating peptides (CPPs)
Research Use Only. Not for human or therapeutic use.
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